DNA or protein can be used as a molecule clock that tells how long it has been since two species have diverged from a common ancestor

Why is the blood that flows from the lungs toward the heart a brighter red than the blood that flows the other direction?

What does the term linkage refer to?

When compared to a cheek cell, a muscle cell contains more (A) vacuoles (B) ribosomes (C) mitochondria (D) chromosomes

How did Pasteur solve Spallanzani's problem of limiting exposure to air?

What is one of the functions of the nucleus? A. to contain the genetic information of an organism B. to remove waste products from a cell C. to provide structural support for a plant cell D. to determine what materials can enter or leave a cell

Which of the following happens during the main-sequence stage of a star's life

Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit?

First to answer this gets 70 pts. Which planet do most known extrasolar planets LEAST resemble? A. Jupiter B. Mars C. Neptune D. Uranus

Which object in our solar system has the greatest density

Nearly all of what in your cells comes from your mother